Build a command-line habit tracker

A command-line habit tracker is a simple yet powerful way to track daily habits and maintain consistency over time. Below is a Python-based command-line habit tracker using a local JSON file for storage. This script supports adding, viewing, completing, and deleting habits.

Features

• Add new habits

• Mark habits as completed for the day

• View status of habits

• Delete habits

• Store data persistently in a JSON file

Requirements

• Python 3.x

• No external libraries needed (uses built-in modules)

Code: habit_tracker.py

python
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import json
import os
from datetime import datetime

DATA_FILE = "habits.json"

def load_data():
    if os.path.exists(DATA_FILE):
        with open(DATA_FILE, "r") as file:
            return json.load(file)
    return {}

def save_data(data):
    with open(DATA_FILE, "w") as file:
        json.dump(data, file, indent=4)

def add_habit(name):
    data = load_data()
    if name in data:
        print(f"Habit '{name}' already exists.")
    else:
        data[name] = {"created": str(datetime.today().date()), "log": []}
        save_data(data)
        print(f"Habit '{name}' added.")

def complete_habit(name):
    data = load_data()
    if name not in data:
        print(f"No such habit: {name}")
        return
    today = str(datetime.today().date())
    if today in data[name]["log"]:
        print(f"Habit '{name}' already marked as complete for today.")
    else:
        data[name]["log"].append(today)
        save_data(data)
        print(f"Habit '{name}' marked as complete for {today}.")

def view_habits():
    data = load_data()
    if not data:
        print("No habits found.")
        return
    today = str(datetime.today().date())
    for habit, info in data.items():
        is_done = today in info["log"]
        status = "✅" if is_done else "❌"
        print(f"{habit}: {status} (Started on {info['created']})")

def delete_habit(name):
    data = load_data()
    if name in data:
        del data[name]
        save_data(data)
        print(f"Habit '{name}' deleted.")
    else:
        print(f"No such habit: {name}")

def show_menu():
    print("nHabit Tracker")
    print("1. Add a new habit")
    print("2. Mark habit as completed")
    print("3. View habits")
    print("4. Delete a habit")
    print("5. Exit")

def main():
    while True:
        show_menu()
        choice = input("Choose an option: ").strip()
        if choice == "1":
            name = input("Enter habit name: ").strip()
            add_habit(name)
        elif choice == "2":
            name = input("Enter habit name to mark as completed: ").strip()
            complete_habit(name)
        elif choice == "3":
            view_habits()
        elif choice == "4":
            name = input("Enter habit name to delete: ").strip()
            delete_habit(name)
        elif choice == "5":
            print("Goodbye!")
            break
        else:
            print("Invalid choice. Please try again.")

if __name__ == "__main__":
    main()

How to Use

1. Save the code in a file named habit_tracker.py

2. Run it in terminal:

   nginx
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   python habit_tracker.py
   

3. Follow the interactive menu to manage your habits.

This tracker is designed for local use. If you want to extend its functionality later, consider adding:

• Weekly/monthly stats

• Notifications/reminders

• Integration with Google Sheets or a database

• A web or GUI interface

Let me know if you’d like an extended version with any of these features.